Rapid whole lifting method and analysis of continuous collapse prevention for long span steel mesh shell
Taking a steel reticulated shell integral lifting project as the research object,an integral lifting construction method was proposed,and the synchronous lifting,deformation control and lifting safety of large-span steel reticulated shell structure were studied.The finite element model was established in Midas Gen,and the anti-progressive collapse performance of the lifting support was analyzed based on the alternate load path method.The whole construction process was simulated and analyzed,and the rationality of the method was verified by the actual construction monitoring data.The results show that the control of cluster electric hoist based on monitoring data feedback+computer algorithm can achieve continuous and synchronous lifting.Applying prestress to the lower part of the reticulated shell structure can effectively control the deviation of the vector height when the structure is formed.The error between the theoretical calculation value and the actual measured value is within 4.5% .The vertical displacement at the top of the shell during the whole construction process meets the design requirements.The instability of the lifting bracket will cause the internal force redistribution of each lifting point.In order to avoid the risk of progressive collapse caused by accidental instability,the design of the lifting bracket against progressive collapse considering the construction economy and safety is proposed.The steel reticulated shell structure is basically consistent with the design state,which verifies the effectiveness of the overall lifting method and provides a reference for the application of the overall lifting project of the large-span steel reticulated shell.
steel structurereticulated shelloverall liftingfinite element analysisdeformation
万方数据
维普
